Method for inhibiting mining damage depth based on clay-based slurry advanced grouting modified bottom plate hard rock

Abstract

The invention relates to a method for inhibiting mining damage depth based on clay-based slurry advanced grouting modified floor hard rock. The method starts from reducing or inhibiting damage depth or range of mining disturbance to a coal seam floor on the premise of not changing a coal mining process, advanced fracturing is conducted on a rock stratum with a certain layer position and thicknesswithin an original mining damage range through a ground or underground horizontal directional drill, penetration of a fracture network in the rock stratum is achieved, then clay-based slurry is injected into the penetration fracture network, the original rock stratum is modified into a clay flexible stratum, the flexible stratum can buffer vertical transmission of advance supporting pressure in afloor rock stratum in the mining process, so that the floor damage depth or range is restrained or reduced, and the purpose of preventing and treating water damage of the coal mine floor is achieved.

Description

technical field [0001] The invention relates to the technical field of water disaster prevention and control in underground engineering such as underground mines, and in particular to a method for suppressing mining damage depth based on clay-based grout for advance grouting to modify floor hard rock. Background technique [0002] Water inrush from the coal mine floor has always been one of the most prominent problems that plague and threaten the safe production of coal mines in my country. According to incomplete statistics, in the past 20 years since the 1990s, more than 250 mines in my country have experienced water inrush and flooding accidents. , The direct economic loss is as high as more than 40 billion yuan, which has brought serious personal casualties and huge economic losses to the enterprise, and also caused great damage to the water environment and water resources in the mining area. With the increase of coal mine mining depth, under the coupling effect of high c...

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Problems solved by technology

For example, a method for preventing and controlling water inrush from coal floor rocks on a confined water body (patent No. CN103291325A), a method for preventing and controlling limestone water in coal seam mining floors (patent No. CN110344850A), and a grouting method for limestone confined aquifers on coal seam floors Reinforcement and transformation method (CN111042831A), method of transforming floor limestone aquifer into natural and artificial composite complete water-resisting layer (CN201510297909.2), a method for comprehensive management of coal mine large mining depth and lower group coal mining prevention and control of water (CN201410088702.X) Patented technologies such as these are all for the purpose of grouting to transform the aquifer or reinforce the water-resisting layer, and have not fundamentally restrained the depth or scope of damage to the mining floor.

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